EGR Valve: Description and Operation

EGR Valve:

PURPOSE
The EGR valve controls the amount of exhaust gas that will be allowed back into the combustion chamber.

LOCATION
Back side of of the Intake Manifold, under the throttle chamber.

OPERATION
The EGR valve contains a spring loaded diaphragm that will move upward when vacuum is applied. The upward movement will lift a tapered valve off it's seat and allow some exhaust gas to pass through into the Intake Manifold.